Hall effect in the mixed state of Nd1.85Ce0.15CuO4−δ

✍ Scribed by A.W. Smith; S.J. Hagen; M. Rajeswari; J.L. Peng; Z.Y. Li; R.L. Greene; S.N. Mao; X.X. Xi; S. Bhattacharya; Q. Li; C.J. Lobb

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 148 KB
• Volume: 194-196
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)91628-4

✦ Synopsis

We observe a sign reversal of the Hall resistivity in the mixed state of the n-type superconductor Ndl.s5Ceo.15CuO4. ~. Such all anomaly, which has also been observed earlier in the p-type oxide superconductors, has been widely attributed to thermoelectric effects, pinning effects, or else to complicated band structures. Recently, based on the systematics of the sign reversal in a wide class of materials, there have been attempts to explain the anomaly as an intrinsic aspect of the vortex motion. The behavior of the Hall resistivity in Ndl.ssCeo.15CuO4. 8 serves as a test for some of the models mentioned above. Particularly, a model based on thermoelectric effects which has been suggested to explain the sign reversal in the p-type superconductor YBa2Cu307. ~ does not predict the sign change in NdLssCeo.~sCuO4. ~. The observation of the Hall anomaly in this n-type system supports the idea that the sign reversal is inuinsically linked to the vortex dynamics in the flux flow state.